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United States Patent |
5,692,249
|
Johnson
|
December 2, 1997
|
Top mounted flush valve
Abstract
A top mounted flush valve is installed from inside a flush tank and does
not require access to the opposite tank wall. A valve body includes an
annular chamber receiving a radially enlarged head portion of a flexible
resilient seal member. A draw ring is fixed to the remote end of a barrel
portion of the seal member. A draw collar has a flange bearing against the
body and a cylindrical portion threaded to the draw ring. Rotation of the
draw collar outwardly collapses the seal barrel portion, and a seal bead
on the seal member head is forced against the inner tank surface. A wall
of the body isolates the draw collar from the seal barrel, and the
enlarged head portion is wedged into the annular chamber to prevent
rotation of the seal member.
Inventors:
|
Johnson; Dwight N. (6327 Chorlito Dr., Carlsbad, CA 92008)
|
Appl. No.:
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664922 |
Filed:
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June 18, 1996 |
Current U.S. Class: |
4/378; 285/39 |
Intern'l Class: |
E03D 001/34 |
Field of Search: |
4/378,417,418
285/39,162,205
|
References Cited
U.S. Patent Documents
3136203 | Jun., 1964 | Davis | 85/40.
|
3348444 | Oct., 1967 | Brignola | 85/70.
|
3879065 | Apr., 1975 | Kobayashi | 285/39.
|
4191409 | Mar., 1980 | Ballantyne | 285/162.
|
4576400 | Mar., 1986 | Allred et al. | 285/162.
|
Other References
Emhart, POP Fastening Systems Group, "Well-Nuts" Threaded Inserts Brochure.
|
Primary Examiner: Phillips; Charles E.
Attorney, Agent or Firm: Mason, Kolehmainen, Rathburn & Wyss
Claims
What is claimed is:
1. A flow device adapted to be mounted in a container wall opening against
a container wall surface, said flow device comprising:
a body defining a segment of a flow path extending in an axial direction
through the container wall opening when the flow device is mounted;
said body including radially spaced inner and outer cylindrical walls and
an annular base wall, said inner and outer and base walls defining an
annular channel having an open side facing in a first axial direction
toward the container wall surface when the flow device is mounted;
said body defining a bearing surface facing in a second axial direction
opposed to said first axial direction;
a seal assembly including a flexible resilient member having a radially
enlarged head portion captured in said annular channel and having a
cylindrical barrel portion extending from said head portion in said first
axial direction;
said seal assembly including a threaded draw ring fixed to the end of said
barrel portion remote from said head portion; and
a draw collar defining an additional segment of said flow path and having a
cylindrical portion rotatably received within said barrel portion and
extending between said bearing surface and said draw ring;
said collar having a radially outwardly extending bearing flange engaging
said bearing surface and said cylindrical portion having threads mating
with said threaded draw ring for drawing said draw ring toward said body
and for deforming said flexible resilient member and radially outwardly
collapsing said barrel portion against the container wall in response to
rotation of said draw collar.
2. A flow device as claimed in claim 1, said body including a valve seat
surrounding said flow path, and a valve member movably mounted on said
body for controlling flow through said valve seat.
3. A flow device as claimed in claim 1, said radially inner wall being
cylindrical and extending in said first axial direction between said
barrel portion of said seal assembly and said cylindrical portion of said
draw collar for preventing transfer or rotational force from said draw
collar to said seal assembly.
4. A flow device as claimed in claim 1, said body bearing surface being
defined on a surface of said annular base wall opposite said annular
channel.
5. A flow device as claimed in claim 1, said annular base wall being a
truncated cone sloped relative to said axial directions.
6. A flow device as claimed in claim 1, said radially enlarged head portion
of said flexible resilient member having a sealing bead projecting in said
first axial direction beyond said radially outer wall toward the container
wall surface before deformation of said flexible resilient member.
7. A flow device as claimed in claim 6, said sealing bead tapering to a
knife-like edge.
8. A flow device as claimed in claim 6, further comprising an annular
groove in said flexible resilient member separating said sealing bead from
the remainder of said radially enlarged head portion.
9. A flow device as claimed in claim 6, said sealing bead being sized to
permit said radially outer cylindrical wall to move into contact with the
container wall surface as said flexible resilient member is deformed.
10. A flow device as claimed in claim 6, said radially enlarged portion
including an annular section overlying said annular base wall of said body
and an axially extending flange portion extending from said annular
portion to said sealing bead and overlying said radially outer cylindrical
wall.
11. A flow device as claimed in claim 10, said annular section and said
annular base wall being conical.
12. A flow device as claimed in claim 11, the intersection of said annular
section and said flange portion having a chamfer like shape defining a
space within said annular channel where said radially enlarged portion is
wedged when said flexible resilient member is deformed.
13. A flow device as claimed in claim 1, said draw collar including a tool
engagement structure formed within said cylindrical portion.
14. A valve for mounting in a mounting opening in a wall of a container,
said valve comprising:
a body defining a flow path and a valve seat surrounding said flow path;
valve means cooperating with said seat for controlling flow along said flow
path;
a mounting system projecting from said body and adapted to be inserted into
the mounting opening from a first side of the wall, said mounting system
including a seal assembly and a draw collar cooperating with said body for
outwardly collapsing said seal assembly in response to rotation of said
draw collar relative to said body;
said seal assembly including a cylindrical flexible seal member and a
rigid, threaded draw ring secured to a first end of said seal member
remote from said body;
said draw collar having a cylindrical threaded wall concentric with and
disposed within said seal member, said threaded wall being threaded into
said threaded draw ring for axially drawing said draw ring toward said
body in response to rotation of said draw collar;
said valve being characterized by:
said seal assembly including a seal flange integral with said seal member
and extending radially outward from the end of said seal member opposite
said draw ring; and
said body including walls defining an annular seal capture chamber
confining said seal flange in radially inward and radially outward and
axial directions.
15. A valve for mounting in a mounting opening in a wall of a container,
said valve comprising:
a body defining a flow path and a valve seat surrounding said flow path;
valve means cooperating with said seat for controlling flow along said flow
path;
a mounting system projecting from said body and adapted to be inserted into
the mounting opening from a first side of the wall, said mounting system
including a seal assembly and a draw collar cooperating with said body for
outwardly collapsing said seal assembly in response to rotation of said
draw collar relative to said body;
said seal assembly including a cylindrical flexible seal member and a
rigid, threaded draw ring secured to a first end of said seal member
remote from said body;
said draw collar having a cylindrical threaded wall concentric with and
disposed within said seal member, said threaded wall being threaded into
said threaded draw ring for axially drawing said draw ring toward said
body in response to rotation of said draw collar;
said valve being characterized by:
said body including a bearing surface and said draw collar having a bearing
flange engaging said bearing surface for preventing axial movement of said
draw collar; and
said valve body having a cylindrical separator wall extending from a second
end of said seal member between said seal member and said draw collar for
preventing the transfer of rotational force from said draw collar to said
seal member.
Description
FIELD OF THE INVENTION
The present invention relates to fluid devices, such as a top mounted flush
valve, adapted to be mounted to a wall of a container, such as a flush
tank, where only a single side of the container wall is accessible.
DESCRIPTION OF THE PRIOR ART
In many applications fluid devices such as valves are mounted in a wall of
a tank or container to permit fluid to flow into or out of the container.
In a typical installation, for example, a threaded shank of a body such as
a valve body can extend through an opening in the container wall, and a
threaded nut can be applied at the opposite side of the container wall.
However, there are many instances when there is no convenient access to
both sides of a container wall. In these applications, there is a need for
a mounting system that permits attaching the fluid device opening from
only one side of the container wall. One example is a flush valve mounted
in the flush tank of a one piece toilet where the only access to the
mounting region is inside the flush tank.
The conventional way to mount a top mounted flush valve is to use a system
including screw fasteners extending through the throat of the flush valve.
The screws engage a spanner or a series of tabs that are drawn up against
the outer, inaccessible surface of the tank wall. A washer between the
tank wall surface and a flange on the valve body is compressed to form a
seal. This known system has disadvantages including cost, the need for
many discrete parts, obstruction of the flow path by the mounting hardware
and the potential for interference with a flapper valve member mounted on
the flush valve body.
It has been proposed to mount various members to walls using a resilient
deformable seal or collar which is inserted from one side through an
opening and then outwardly collapsed. Typically a threaded draw member or
screw is rotated to draw the remote end of a flexible seal member toward
the wall. A problem with these known devices is that rotational forces can
be transferred from the rotating draw member to the seal. If the seal
rotates, it is not drawn into the desired mounting position. Various
inconvenient and unreliable expedients have been proposed to prevent the
seal from rotating when the draw member is rotated.
U.S. Pat. No. 3,136,203 discloses a blind rivet including a bolt 15 having
a shank threaded into a threaded section 25 of a case 16. When the bolt is
rotated, the case is compressed and expands radially to form a locking
ring 30. The case has an undercut intermediate portion 24. To prevent
rotation of the case when the bolt is rotated, the case is held by a tool
engaged with slots 22 in a head portion of the case.
U.S. Pat. No. 3,348,444 discloses an expansion fastener including a
resilient member 16 and a screw 36 threaded into nuts 28 and 30 received
in recesses in the resilient member. A recess 27 assists in starting the
collapse and outward bulging of a barrel portion of the resilient member
when the screw 36 is rotated relative to the resilient member. A large
flange 20 of the resilient member is clamped between a support panel 14
and an attached article 12 and is intended to hold the resilient member
against rotation when the screw is rotated. Sufficient axial force must be
applied to the flange to achieve this result.
U.S. Pat. No. 3,879,065 discloses couplings for sanitary appliances in
which a flexible cylindrical body is elastically expanded to mount the
coupling to an opening in a wall of the appliance. A main body is threaded
into a ring fixed to the lower portion of the flexible body and the main
body is rotated to diametrically inflate the flexible body. Frictional
contact is intended to prevent rotation of the flexible body (see column
5, lines 41-46 and FIGS. 3-5). Alternatively a tool is used to hold the
flexible member stationary while the main body is rotated (see column
31-37 and FIGS. 6-10B).
SUMMARY OF THE INVENTION
A principal object of the present invention is to provide an improved fluid
device, for example a tank mounted flush valve, that is mounted to a
container wall from one side of the wall. Other objects are to provide a
fluid device in which rotational forces from a rotating draw member used
to draw the seal into a mounted position are isolated from the seal
assembly; to provide a device in which the frictional torque applied to
the seal assembly is limited to frictional engagement of the draw threads;
to provide a device in which the seal assembly is dynamically restrained
against rotation without relying on axial forces externally applied to the
seal assembly; and to provide a tank mounted flush valve or other fluid
device overcoming problems with devices of the prior art.
In brief, in accordance with the invention there is provided a flow device
such as a top mounted flush valve adapted to be mounted in a container
wall opening against a container wall surface. The flow device has a body
defining a segment of a flow path extending in an axial direction through
the container wall opening when the flow device is mounted. The body
includes radially spaced inner and outer cylindrical walls and an annular
base wall, the inner and outer and base walls defining an annular channel
having an open side facing in a first axial direction toward the container
wall surface when the flow device is mounted. The body defines a bearing
surface facing in a second axial direction opposed to the first axial
direction. A seal assembly includes a flexible resilient member having a
radially enlarged head portion captured in the annular channel and a
cylindrical barrel portion extending from the head portion in the first
axial direction. The seal assembly includes a threaded draw ring fixed to
the end of the barrel portion remote from the head portion. A draw collar
defines an additional segment of the flow path and has a cylindrical
portion rotatably received within the barrel portion and extending between
the bearing surface and the draw ring. The collar has a radially outwardly
extending bearing flange engaging the bearing surface and the cylindrical
portion has threads mating with the threaded draw ring for drawing the
draw ring toward the body and for deforming the flexible resilient member
and radially outwardly collapsing the barrel portion against the container
wall in response to rotation of the draw collar.
BRIEF DESCRIPTION OF THE DRAWING
The present invention together with the above and other objects and
advantages may best be understood from the following detailed description
of the preferred embodiments of the invention illustrated in the drawings,
wherein:
FIG. 1 is a sectional view of a top mounted flush valve embodying the
present invention, taken along the axis of the flow path through the
valve, and illustrating the valve prior to mounting the valve to a tank
wall;
FIG. 2 is a view similar to FIG. 1 illustrating the assembled valve mounted
in place on the bottom wall of a flush tank;
FIG. 3 is a top view of the draw collar of the valve;
FIG. 4 is a top view of a tool used to mount the valve;
FIG. 5 is an enlarged, fragmentary sectional view of an alternative
configuration of the seal bead of the seal assembly of the valve; and
FIG. 6 is an enlarged, fragmentary sectional view of another alternative
configuration of the seal bead of the seal assembly of the valve.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Having reference now to the drawings, in FIG. 1 there is illustrated a top
mounted flush valve generally designated as 10 and constructed in
accordance with the principles of the present invention. The valve 10 is
adapted to be mounted in an opening 12 in the bottom wall 14 of a toilet
flush tank 16, a portion of which is seen in FIGS. 1 and 2. The tank 16 is
part of a one piece toilet. From the tank interior, access may be had to
the interior tank wall surface 14A, but there is no access to the exterior
tank wall surface 14B. Thus the valve 10 must be mounted from a single
side of the wall 14 at the interior of the tank.
Valve 10 includes a molded plastic valve body 18 having a generally
cylindrical wall section 20 defining the upper segment 22 of a flow
passageway extending through the valve 10. The flow segment 22 terminates
at a valve seat 24 within the tank 16. A lateral passage 26 extends to a
collar 28 receiving a toilet overflow tube 30. Mounting studs 32 extend
from the collar 28 for supporting a flush or flapper valve member 34 (FIG.
2) that cooperates with the valve seat 24 in a conventional manner for
controlling flow through the valve 10.
An annular chamber or channel 36 is defined between an inner circular wall
38 and a coaxial outer circular wall 40. An annular base wall 42 extends
between walls 38 and 40 and closes one side of the chamber 36. The
opposite side of chamber 36 is open, and faces toward the inner tank wall
surface 14A.
A seal assembly 44 includes a molded flexible resilient seal body 46 and a
relatively rigid molded plastic draw ring 48 having an internal thread
structure 50. A radially enlarged head portion 52 of the body 46 is
captured within the annular chamber 36. The body 46 also includes a
cylindrical barrel portion 54 that extends through the opening 12 when the
valve 10 is placed in position for mounting as seen in FIG. 1. The draw
ring 48 is fixed to the remote end of the barrel portion 52. In the
preferred embodiment of the invention, the draw ring 48 is pre-molded of
polypropylene and the body 46 is molded of a blend of polypropylene and
ethylene-polypropylene rubber. When the body 46 is injection molded over
the ring 48, an intermolecular bond firmly joins the ring 48 and the body
46.
The head portion 52 includes a radially extending flange portion 56 that
overlies the annular base wall 42 of the chamber 36. An axially extending
flange 58 extends from the outer diameter of the flange portion 56 within
the outer wall 40. A tapered seal bead 60 is formed at the end of the
axially extending flange 58. Before the valve is mounted to the wall 14,
the seal bead 60 projects beyond the end of the outer wall 40.
A cylindrical draw collar 62 is rotatably received within the barrel
portion 54 and has threads 64 engaged with the thread structure 50 of the
draw ring 48. At its upper end, the draw collar 62 has a radially
outwardly extending bearing flange 66 that bears against a body bearing
surface 67 formed on the surface of annular wall 42 opposite to the
chamber 36. The cylindrical portion of draw collar 62 defines a lower
segment 68 of the flow path through the valve 10, and includes a plurality
of axially extending tool engagement fins 70.
In order to mount the flush valve 10 in the tank 16, the valve 10 is first
positioned as seen in FIG. 1 with the valve body 18 in the tank 16 and the
draw collar 62 and the barrel portion 54 of the seal body 46 extending
through the opening 12. With the seal bead 60 lightly contacting the wall
14, the outer chamber wall 40 is spaced from the surface 14A.
An installation tool 72 is seen in FIGS. 1 and 4. It includes a plurality
of slots 74 that mate with the fins 70 of the draw collar 62. A central
drive hole 76 receives a suitable driver of complementary shape to rotate
the tool 72 and the draw collar 62. The bearing flange 66 engages the
bearing surface 67 and prevents axial movement of the draw collar 62.
Rotation of the draw collar 62 draws the draw ring 48 toward the body 18
due to engagement of threads 64 with the thread structure 50.
The inner chamber wall 38 of the body 18 extends around the draw collar 62
from the bearing flange 66 substantially to the threads 64. The wall 38 is
received within the barrel portion 54 of the seal body 46. As a result,
the wall 38 separates and isolates the draw collar from the seal assembly,
preventing the transfer of rotational forces from the rotating draw collar
to the seal body 46. The only rotational torque applied to the seal
assembly is that which necessarily results from the threaded engagement of
the draw ring 48 with the draw collar 62.
As the draw ring is forced upwardly, the barrel portion 54 collapses
radially outwardly. A groove 78 is formed in the inner surface of the
barrel portion 54 (FIG. 1). The undercut groove 78 localizes the
compressive stress to control the location of barrel deformation and to
reduce the axial force required to deform the seal body 46.
As the seal body 46 is deformed, the axially directed reaction force
applied from the draw collar 62 to the valve body 18 through the bearing
flange-bearing surface interface 66-67 forces the valve body 18 toward the
wall 14. The seal bead 60 compresses due to engagement with the inner tank
wall surface 14A. The material of the head portion 52 of the seal body 46
is wedged or jammed up into the annular chamber 36, dynamically locking
the seal body 46 against rotation. The annular base wall 42 and the
radially extending flange 56 are sloped or conical in shape to provide a
capture region included within an acute angle to augment this locking
action. As can be seen in FIG. 1, clearance at the intersection of walls
40 and 42 provides a space into which material of the seal body 46 is
jammed to achieve the dynamic locking effect.
The outer chamber wall 40 is drawn into contact with the inner tank surface
14A. This limits the force applied to the seal bead 60 and thus the
deformation of the enlarged head portion 52 of the seal body 46. In
addition, engagement of the wall 40 against the tank results in firm
positioning of the valve 10 in the tank, even if the tank wall is rough
and uneven.
In the installed position seen in FIG. 2, the seal body barrel portion 54
is outwardly deformed into a mounting flange 80 radially terminating in
the region of the groove 78. The flange 80 firmly engages the outer wall
surface 14B to hold the valve 10 in position. The tapered seal bead 60 is
compressed into reliable, compliant sealing relation with the inner tank
wall 14A. Flow through the flow segments 22 and 68 is relatively
unimpeded.
An alternative seal bead configuration 60' is seen in FIG. 5. In this
arrangement, the bead 60' has a fairly sharp, knife-like edge 82 at the
outer periphery of the head portion 52. Another alternative seal bead
configuration 60.increment. is shown in FIG. 6. This configuration
includes an annular corrugation providing a groove 84. These alternative
configurations are intended to provide compliance to a rough tank wall
surface and to achieve reliable sealing.
While the present invention has been described with reference to the
details of the embodiments of the invention shown in the drawing, these
details are not intended to limit the scope of the invention as claimed in
the appended claims.
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